JP2009194688A - Image transfer apparatus, image display device, image display system, transfer method of image data, image display method, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for improving user convenience in a case where a network is disconnected abnormally. <P>SOLUTION: An image transfer apparatus for sequentially transferring continuous image data to an image display device via a network includes a storage unit capable of storing image data and a control unit. The control unit sequentially transmits image data to the image display device while the network is connected, sequentially stores following image data in the storage unit when abnormal disconnection of the network is detected, and sequentially transfers the image data stored in the storage unit to the image display device when recovery of the network is detected. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image transfer apparatus and an image display apparatus connected via a network.

  In a projector, an image may be displayed based on image data transferred from a personal computer (hereinafter abbreviated as PC) via a wireless network. For example, when a moving image displayed on a display is captured in a PC and the captured data is continuously transferred to a projector, an image based on the received captured data is generated in the projector, and a display screen (for example, , The same moving image as the moving image displayed on the display of the PC is displayed on the screen.

Japanese Patent Laid-Open No. 2002-232706 JP-A-2005-354639

  However, in a conventional projector, if the wireless network is abnormally disconnected while continuous image data (moving image data) is being transferred, capture data from the PC will not reach and there will be no image to be displayed. Therefore, the display screen is returned to the initial state, and, for example, a logo mark is displayed.

  While the wireless network is disconnected, the PC continues to display a moving image on the display, and performs capture processing and sends it out from the PC. However, while the wireless network is disconnected, the captured data does not reach the projector and does not remain in the PC. Therefore, when the wireless network is connected again, the image displayed by the projector is not a continuation when the wireless network is abnormally disconnected, but is an image displayed on the PC from the time of abnormal disconnection of the wireless network to the time of recovery. The image goes ahead and goes ahead.

  Therefore, after the wireless network recovers, in order to display on the projector from the continuation at the time of abnormal disconnection of the wireless network, the user searches the image at the time of abnormal disconnection of the wireless network by operating the PC, and the image data from the continuation Therefore, the user may feel inconvenient because it is necessary to perform an operation such as transferring data.

  Such a problem is not limited to the case where image data is transferred and displayed via a wireless network, but is a problem common to the case where image data is transferred via a wired network. Further, the problem is not limited to communication between the PC and the projector, but is a problem common to various transceivers that transmit and receive images such as between the PC and the PC.

  Accordingly, an object of the present invention is to provide a technique for improving user convenience when a network is abnormally disconnected.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

Application Example 1 An image transfer device that sequentially transfers continuous image data to an image display device via a network,
A storage unit capable of storing the image data;
A control unit;
With
The controller is
While the network is connected, the image data is sequentially transmitted to the image display device, and when the abnormal disconnection of the network is detected, the subsequent image data is sequentially stored in the storage unit, and An image transfer apparatus characterized in that upon detecting network recovery, the image data stored in the storage unit is sequentially transferred to the image display apparatus.

  In this way, even when an abnormal network disconnection occurs during the sequential transfer of the continuous image data to the image display device in the image transfer device, the network transfer is performed in the image transfer device when the network is restored. Since the subsequent image data at the time of abnormal disconnection can be transferred to the image display device, the image at the time of abnormal disconnection of the network can be displayed on the image display device.

  Therefore, after the network is recovered, the user operates the image transfer device to search for an image at the time of abnormal network disconnection, and transfers image data from the subsequent image to display on the projector from the time of the abnormal network disconnection. The convenience of the user is improved. The abnormal disconnection refers to a state in which the network is disconnected due to an external factor or the like instead of being disconnected according to a user instruction while the network is connected.

Application Example 2 An image display device that displays an image based on image data transferred from an image transfer device via a network,
An image display control unit,
The image display control unit
While the network is connected, images are sequentially displayed based on the received image data, and when an abnormal disconnection of the network is detected, the image displayed at the time of detection is displayed until the network recovers. An image display device characterized by that.

  In this way, if the network display is abnormally disconnected while the image display apparatus continuously receives and sequentially displays the image data, the image display apparatus displays when the network is abnormally disconnected. The displayed image is displayed until the network is restored. Then, for example, when the network is abnormally disconnected, compared to the case where the display image returns to the initial state (for example, a logo mark is displayed), the network recovers, and the received image data is changed again. When displaying an image based on this, it is possible to reduce a sense of discomfort felt by the user.

  The present invention is not limited to the image transfer device and the image display device described above, and the image transfer device and the image display system including the image display device, the image data transfer method, the image display method, and the computer program are provided. It is also possible to implement in various modes such as a mode.

Hereinafter, the best mode for carrying out the present invention will be described in the following order based on examples.
A. Example:
A-1. Example configuration:
A-2. Example operation:
A-3. Effects of the embodiment Variations:

A. Example:
A-1. FIG. 1 is a conceptual diagram showing the concept of an image display system 1000 according to the present invention. As illustrated, the image display system 1000 includes a PC 100 as an image transfer device and a projector 200 as an image display device. The PC 100 and the projector 200 are connected peer-to-peer via a wireless network. The PC 100 captures the display screen displayed on the display 112 and transfers it as image data to the projector 200 via the wireless network. Hereinafter, the image data obtained by capturing the display screen is referred to as capture data 300. The projector 200 generates an image based on the capture data 300 received via the wireless network, and causes the screen 250 to project the image.

  In this embodiment, the PC 100 executes predetermined presentation software (for example, Microsoft Power Point (registered trademark)), and sequentially displays a series of images on the display 112 (generally referred to as a slide show). ). At the same time, the display image is captured and the captured data is transferred to the projector 200. Therefore, the projector 200 can sequentially project a series of images on the screen 250 in synchronization with the display screen of the PC 100. In this embodiment, continuous capture data generated by capturing a slide show display image corresponds to continuous image data in the claims.

  FIG. 1 illustrates a case where the first to fifth images (slide show images) are sequentially displayed on the display 112 in the PC 100 (the first to fifth images are not shown). Capture data 301 obtained by capturing the first image displayed on the display 112 is displayed in a cylindrical shape numbered 1. Similarly, capture data 302 to 305 corresponding to the second to fifth images are displayed with corresponding numbers. On the other hand, the image displayed on the projector 200 side is displayed by assigning the number 1 to the image 251 based on the capture data 301, and similarly, the images 252 to 255 based on the capture data 302 to 305 are also supported. A number is attached and displayed. In other words, FIG. 1 conceptually shows a state in which continuous capture data 301 to 305 are sequentially transmitted from the PC 100 and the projector 200 sequentially displays continuous images 251 to 255 based on the received capture data. It shows.

  FIG. 2 is a block diagram illustrating a schematic configuration of the PC 100. The PC 100 mainly includes a CPU 102, a memory 104, a communication unit 108, an input unit 110, and a display 112, which are connected via a bus. The CPU 102 performs various processes and controls according to the computer program stored in the memory 104. For example, in accordance with an application program (Power Point) stored in the memory 104, processing for displaying images in a slide show format is performed.

  The memory 104 includes a ROM and a RAM, and stores the computer program, data obtained during processing, and the like. As will be described later, when the wireless network is abnormally disconnected, the capture data 300 is stored.

  Communication unit 108 includes a wireless LAN card, and can directly communicate with communication unit 208 provided in projector 200 via a wireless network. In this embodiment, as described above, the communication unit 108 sends the capture data 300 to the projector 200, but also sends various data such as MPEG moving image data and JPEG photo data. can do.

  The input unit 110 includes a keyboard and a pointing device, and inputs an instruction from the user. The display 112 includes a liquid crystal display and displays an image and the like. The CPU 102 in this embodiment corresponds to the control unit in the claims, and the memory 104 corresponds to the storage unit in the claims.

  FIG. 3 is a block diagram illustrating a schematic configuration of the projector 200. The projector 200 includes a CPU 202, a memory 204, an image processing unit 206, a communication unit 108, a light source lamp 220, a liquid crystal panel 222, and a projection optical system 224. The CPU 202, the memory 204, the image processing unit 206, and the communication unit 108 are connected by a bus. The projector 200 is further provided with an operation unit (not shown) including buttons provided on the projector 200 body, a remote controller, and the like. The user can perform various settings regarding the projector 200 by operating the operation unit. The CPU 202 in this embodiment corresponds to the image display control unit in the claims.

  The CPU 202 performs various processes and controls according to the computer program stored in the memory 204. The communication unit 208 receives capture data transferred from the PC 100 via a wireless network. The image processing unit 206 performs image processing on the capture data received via the communication unit 208 and supplies the processed image data to the liquid crystal panel 222. Note that the image processing unit 206 similarly performs image processing on image data given from the outside, such as a PC, a DVD player, or an external memory connected to an external connection connector (not shown). .

  The liquid crystal panel 222 modulates the light emitted from the light source lamp 220 using the image data provided from the image processing unit 206, and emits light representing an image. The projection optical system 224 projects the light emitted from the liquid crystal panel 222 onto the screen 250, and as a result, an image is displayed on the screen.

A-2. Example operation:
FIG. 4 is a flowchart showing the operation of the image display system 1000 of the present embodiment. FIG. 5 is an explanatory diagram conceptually showing the operation of the image display system 1000 of the present embodiment. In FIG. 5, for the sake of clarity, five consecutive capture data before and after the wireless network is abnormally disconnected are illustrated.

  In this embodiment, in the image display system 1000, the wireless network is abnormally disconnected while the projector 200 is projecting an image on the screen 250 based on the capture data 300 transferred from the PC 100 via the wireless network. The operation of the image display system 1000 will be described.

  First, when the user starts up the PC 100 and the projector 200 and operates the input unit 110 of the PC 100 to start up a projector-dedicated application, the CPU 202 of the PC 100 executes a projector driver program stored in the memory 104. . The PC 100 and the projector 200 negotiate with each other to establish a connection via the wireless network.

  Subsequently, when the user operates the input unit 110 to start an application (Power Point) and inputs an instruction to display a slide show, the CPU 202 of the PC 100 executes an application program stored in the memory 104. The slide show is displayed on the display 112.

  The CPU 102 of the PC 100 captures the display screen in synchronization with the switching of the slide show screen (step U102), and transfers the capture data 300 to the projector 200 via the wireless network (step U104). When the communication unit 208 of the projector 200 receives capture data (step S102), the CPU 202 instructs the image processing unit 206 to perform image processing.

  The image processing unit 206 performs various image processing on the received capture data, and supplies the processed image data to the liquid crystal panel 222. The projection optical system 224 projects the light emitted from the liquid crystal panel 222 onto the screen 250 after being modulated based on the processed image data. As a result, the same image as the display screen displayed on the display 112 of the PC 100 is displayed on the screen 250 (step S104).

  The CPU 102 and the CPU 202 always include wireless network connection (including connection by a user instruction and recovery after abnormal disconnection) and disconnection (disconnection by a user instruction and abnormal disconnection) via the communication units 108 and 208, respectively. ) Is detected. While the PC 102 detects the connection of the wireless network in the PC 100 (No in Step U106), the CPU 102 repeats Steps U102 to U104. On the other hand, while projector 202 detects the connection of the wireless network in projector 200 (No in step S106), CPU 202 repeats steps S102 to S104.

  If the wireless network is abnormally disconnected due to an external factor while the PC 100 continuously transfers capture data to the projector 200 (FIG. 5A), the CPU 102 of the PC 100 causes the communication unit 108 to be connected. Thus, an abnormal disconnection of the wireless network is detected (Yes in step U106). Similarly, CPU 202 of projector 200 detects an abnormal disconnection of the wireless network via communication unit 208 (Yes in step S106).

  As shown in FIG. 5A, the capture data 301 and 302 are sequentially transferred until the wireless network is abnormally disconnected. In the projector 200, images 251 and 252 are sequentially displayed based on the capture data 301 and 302.

  In the PC 100, the CPU 102 causes the display 112 to continuously display the above slide show even after the wireless network is abnormally disconnected. When the CPU 102 detects an abnormal disconnection of the wireless network (Yes in Step U106), the display screen is still captured as before (Step U108). However, as shown in FIG. The data is stored in the buffer memory (RAM) of the memory 104 (step U110). Hereinafter, storing in the buffer memory is also referred to as buffering. As shown in FIG. 5B, the CPU 102 sequentially buffers the capture data 304 and 305 in order from the capture data 303 following the capture data 302 transferred immediately before the wireless network is abnormally disconnected. ing.

  On the other hand, in projector 200, when CPU 202 detects an abnormal disconnection of the wireless network (Yes in step S106), it keeps projecting the image projected on screen 250 as it is (step S108). In the projector 200, processed data obtained by performing image processing in the image processing unit 206 on the received capture data is temporarily stored in the memory 204. Therefore, the CPU 202 causes the liquid crystal panel 222 to emit light representing an image using the processed data corresponding to the received capture data 302 stored in the memory 204 immediately before the wireless network is abnormally disconnected. . Then, the image 252 is displayed on the screen 250 by the projection optical system 224 (FIG. 5B).

  Then, as shown in FIG. 5B, the CPU 202 of the projector 200 performs a wireless network reconnection process via the communication unit 208 (step S110). The CPU 202 does not detect the connection of the wireless network until the connection of the wireless network is restored (No in step S111), and thus the wireless network reconnection process (step S110) is repeatedly performed. When the wireless network connection is restored, the CPU 102 of the PC 100 detects the restoration of communication via the communication unit 108 (Yes in step U111), and capture data stored in the buffer memory (hereinafter also referred to as buffering data). Are sequentially transferred to the projector 200. That is, as shown in FIG. 5C, the capture data 304 and 305 are sequentially transferred sequentially from the capture data 303 following the capture data 302 when the wireless network is abnormally disconnected.

  Even after the wireless network is restored, the slide show is continuously displayed on the display 112. The CPU 102 captures the display screen (step U114), buffers it (step U116), and sequentially transfers the buffering data to the projector 200. The buffering data is sequentially erased from the memory 204 at a predetermined timing after being transferred to the projector 200.

  In projector 200, when CPU 202 detects the recovery of the wireless network via communication unit 208 (Yes in step S111), it receives capture data (step S112). Then, an image is projected on the screen 250 based on the received capture data (step S114). That is, as illustrated in FIG. 5C, an image 254 based on the capture data 304 and an image 255 based on the capture data 305 are sequentially displayed on the screen 250 in order from the image 253 based on the capture data 303.

  While the wireless network is connected, the PC 100 repeats steps U112 to U114, and at the same time, the projector 200 repeats steps S112 to S114. As a result, images are sequentially displayed on the screen 250.

A-3. Effects of the embodiment:
According to the image display system 1000 of the present embodiment, even if the wireless network is abnormally disconnected due to an external factor, the image displayed on the screen 250 when the wireless network is abnormally disconnected (the image in FIG. 5). 252) is displayed. When the wireless network is recovered, the subsequent images (images 253, 254, and 255 in FIG. 5) when the wireless network is abnormally disconnected are sequentially displayed. Therefore, after the wireless network recovers, the user operates the PC to search for an image at the time of abnormal disconnection of the wireless network and transfers image data from the subsequent to display on the projector from the time of the abnormal disconnection of the wireless network The convenience of the user is improved because there is no need to perform such work.

  In addition, since the projector 200 automatically performs wireless network reconnection processing, the user does not need to perform wireless network connection processing again, and the convenience of the user is improved.

B. Variations:
The present invention is not limited to the above-described embodiments, and can be carried out in various modes without departing from the gist thereof.

  (1) In the above embodiment, the PC 100 captures the slide show display screen and transfers the continuous capture data to the projector 200. However, the continuous image data is described above. The present invention is not limited to the examples. For example, the PC 100 may reproduce a DVD to display an image, capture the display screen, and transfer it as continuous image data. Further, for example, a moving image file such as MPEG format or a still image (eg, photo data) such as JPEG format may be transferred continuously.

  For example, when transferring a moving image file from the PC 100 to the projector 200 via a wireless network, the moving image file connected in a daisy chain is divided into predetermined units, and each unit is sequentially transferred. If the wireless network is abnormally disconnected, the same effect as the above-described embodiment can be obtained by buffering for each unit. In particular, when transferring a moving image file, if the wireless network is abnormally disconnected and the image displayed on the screen by the projector 200 is displayed as it is, the uncomfortable feeling caused by the interruption of the image is reduced. be able to.

  Further, for example, when a moving image file such as a movie is transferred to the projector 200 and displayed, the PC 100 may transfer the image data after the wireless network is abnormally disconnected at a predetermined interval. . In this way, on the projector 200 side, a moving image as if fast-forwarding playback is displayed. Normally, even after the wireless network is abnormally disconnected, since the moving image file is continuously displayed on the PC 100 side, when the projector 200 side displays the video file continuously after the wireless network is restored, the PC 100 is displayed. There is a time lag between the display screen and the display image of the projector 200. However, as described above, when a moving image that has been played back in fast forward is displayed on the projector 200, the display image of the projector 200 is displayed on the display screen of the PC 100 after a predetermined time has elapsed after the wireless network is restored. Will catch up. If the display image of the projector 200 catches up with the display screen of the PC 100, then the moving image file may be transferred in the same manner as before the wireless network is abnormally disconnected. In this way, even if the wireless network is abnormally disconnected in the middle, the image displayed by the projector 200 is not interrupted, and the moving image can be displayed by the projector 200 again in synchronization with the display screen of the PC 100. It becomes like this.

  (2) In the embodiment described above, the PC 100 is used as the image transfer device and the projector 200 is used as the image display device. However, the present invention is not limited to this, and a PC having a display screen may be used as the image display device. Further, a hard disk recorder or the like may be used as the image transfer device, and a television receiver or the like may be used as the image display device. Even if it does in this way, the effect similar to an above-mentioned Example can be acquired.

  (3) In the above-described embodiment, the case where the PC 100 and the projector 200 are peer-to-peer connected via a wireless network has been described as an example. However, the PC 100 and the projector 200 serve as an access point (base station). You may make it the structure connected through this. Moreover, you may make it the structure connected by a wired network. Even if it does in this way, the effect similar to an above-mentioned Example can be acquired.

  (4) In the above-described embodiment, after detecting abnormal disconnection of the wireless network, the projector 200 is configured to perform reconnection processing of the wireless network. However, the PC 100 may be configured to perform reconnection processing. Good. Further, although the reconnection process is automatically performed, a configuration in which the user manually performs the reconnection process may be employed.

It is a conceptual diagram which shows the concept of the image display system 1000 of this invention. It is a block diagram which shows schematic structure of PC100. 2 is a block diagram illustrating a schematic configuration of a projector. FIG. It is a flowchart which shows operation | movement of the image display system 1000 of a present Example. It is explanatory drawing which shows notionally the operation | movement of the image display system 1000 of a present Example.

Explanation of symbols

100 ... PC
102 ... CPU
104 ... Memory 108 ... Communication unit 110 ... Input unit 112 ... Display 200 ... Projector 202 ... CPU
204 ... Memory 206 ... Image processing unit 208 ... Communication unit 220 ... Light source lamp 222 ... Liquid crystal panel 224 ... Projection optical system 250 ... Screen 251, 252, 253, 254, 255 ... Image 300, 301, 302, 303, 304, 305 ... Capture data 1000 ... Image display system

Claims (6)

An image transfer device that sequentially transfers continuous image data to an image display device via a network,
A storage unit capable of storing the image data;
A control unit;
With
The controller is
While the network is connected, the image data is sequentially transmitted to the image display device, and when the abnormal disconnection of the network is detected, the subsequent image data is sequentially stored in the storage unit, and An image transfer apparatus characterized in that upon detecting network recovery, the image data stored in the storage unit is sequentially transferred to the image display apparatus. An image display device that displays an image based on image data transferred from an image transfer device via a network,
An image display control unit,
The image display control unit
While the network is connected, images are sequentially displayed based on the received image data, and when an abnormal disconnection of the network is detected, the image displayed at the time of detection is displayed until the network recovers. An image display device characterized by that. An image display system comprising an image transfer device and an image display device, wherein the image display device displays an image based on image data transferred from the image transfer device via a network,
The image transfer device includes:
A storage unit capable of storing the image data;
A control unit;
With
The controller is
While the network is connected, continuous image data is sequentially transferred to the image display device, and when abnormal disconnection of the network is detected, the subsequent image data is sequentially stored in the storage unit, and When the recovery of the network is detected, the image data stored in the storage unit is sequentially transmitted to the image display device, and
The image display device includes:
An image display control unit,
The image display control unit
While the network is connected, images are sequentially displayed based on the received image data, and when an abnormal disconnection of the network is detected, the image displayed at the time of detection is displayed until the network recovers. An image display system characterized by that. In an image transfer device, a method of sequentially transferring continuous image data to an image display device via a network,
(A) sequentially transferring the image data to the image display device via the network;
(B) detecting the state of the network;
(C) If an abnormal disconnection of the network is detected in the step (b), then the subsequent image data is sequentially stored in a storage unit included in the image transfer device;
(D) in the step (b), when the recovery of the network is detected, the step of sequentially transferring the image data stored in the storage unit to the image display device;
An image data transfer method comprising: A method for displaying an image on an image display device connected to a network,
(A) displaying an image based on the image data received via the network;
(B) detecting the state of the network;
(C) if an abnormal disconnection of the network is detected in the step (b), a step of displaying an image displayed at the time of detection until the recovery of the network is detected;
An image display method comprising: A computer program,
To the image transfer device connected to the image display device via the network,
A function of sequentially transferring continuous image data to the image display device via the network;
A function of detecting the state of the network;
When the abnormal disconnection of the network is detected, a function of sequentially storing the subsequent image data in a storage unit included in the image transfer device;
A function for sequentially transferring the image data stored in the storage unit to the image display device when recovery of the network is detected;
Computer program for realizing.

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